Fixture for drilling key recesses



July 29, 1969 A. QCREPINSEK 2 FIXTURE FOR DRILLING KEY RECESS ES Filed Oct. 26, 1967 2 Sheets-Sheet 1 INVENTOR. ALOIS CREPINSEK ATTO NEYS y 9 A. CREPINSEK 3,457,829

FIXTURE FOR DRILLING KEY RECESSES Filed Oct. 26. 196'? 2 Sheets-Sheet 2 I00 l5 lOb INVENTOR. ALOIS CREPINSEK FIG.? I Y M l ATTO evs United States Patent 3,457,829 FIXTURE FOR DRILLING KEY RECESSES Alois Crepinsek, Division and Dell Sts., Campbell, Calif. 95008 Filed Oct. 26, 1967, Ser. No. 678,339 Int. Cl. B23c 1/16, 7/00; B23b 43/00 US. Cl. 9013.05 4 Claims ABSTRACT OF THE DISCLOSURE A fixture for drilling recesses into key faces at predetermined angles. The fixture employs a substantially square block provided with a hole for receiving the key blank. Several sets of drill-receiving holes, individual ones of which are at predetermined angles with respect to selected faces of the key, are provided to the block intercepting the key-receiving hole. The drill-receiving holes may be at right angles to faces of the block and the keyreceiving hole may be offset with respect to the faces of the block to provide different predetermined angles between the drill-receiving holes and the key faces. The fixture is also provided with a stepped support on which the block is adapted to be positioned and which gauges the depths of the recesses drilled into the key.

This invention relates to a fixture for drilling predetermined key combinations employing angles with respect to the faces of the key.

An object of this invention is to provide an improved fixture for drilling predetermined key combinations into key blanks to produce one or more keys for tumbler type cylinder locks in which the tumblers are set at predetermined angles with respect to faces of the key.

Another object of this invention is to provide a fixture to be used for making duplicate keys for cylinder type tumbler locks so that the tumbler receiving recesses maybe formed in the key at the precise angles and to the precise depths required.

Another object of this invention is to provide a fixture to be used in the drilling of tumbler-receiving recesses into a tumbler lock key, the fixture employing a keyreceiving block which is provided with several series of holes disposed at predetermined angles with respect to the key corresponding to the angles of the tumblers in the lock with which the key is to be employed, the aforesaid block being adapted to be supported by a stepshaped support which is used to determine the depths of the recesses drilled into the key.

Other and further objects of this invention will be apparent to those skilled in the art to which it relates from the following specification, claims and drawing in which, briefly:

FIG. 1 is an exploded perspective view of this fixture showing the key-receiving block raised above the support therefor and showing a key blank in broken outline aligned with the key-receiving hole of the block;

FIG. 2 is another exploded view showing three of the key-receiving blocks in vertical cross section raised above the stepped support;

FIG. 3 is a plan view showing one of the key-receiving blocks positioned on the stepped support;

FIG. 4 is a sectional view showing another key-receiving block;

FIG. 5 is a side view of the block shown in FIG. 4;

FIG. 6 is a sectional view of a cylinder tumbler lock in which the tumblers are positioned at right angles to the faces of the key; and

FIG. 7 is a sectional view taken through another turnbler lock in which the tumblers on opposite faces of the key are positioned at different predetermined. angles with respect to these faces.

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Referring to the drawing in detail, reference numeral 10 designates the key-receiving block of this fixture. This block is provided with end faces 11 and 12 and prism faces 13, 14, 15 and 16. A key-receiving hole '17 of substantially rectangular cross section extends between the end faces 11 and 12. The key blank 17a is inserted into the hole 17 when tumbler-receiving recesses are to be drilled into the faces of the key by a drill bit 18. For this purpose sets of drill-receiving holes 13', 14' and 15 are provided to the faces 13, 14 and 15, respectively. These sets may each have three or four holes. For example, four holes 13 are provided to face 13 and three holes 14' are provided to the face 14, as shown in FIG. 1. Four holes are also provided to the face 15, as shown in broken outline in FIG. 5. Also, it will be noted that the different sets of holes 13, 14' and 15' are offset with respect to each other, as shown in FIG. 5.

When the recesses are being drilled into the faces of the key 170, the block 10 is positioned on the support 19 which is provided with steps 20, 21, 22, 23 and 24. These steps are made of predetermined heights so that the block 10 and the key positioned therein may be placed on different ones of the steps during the drilling of the different receses in the key, depending upon how deep the different recesses are to be drilled into the key. Thus, if a shallow recess is desired in the key face, the block and key are positioned on step 20, whereas, if a relatively deep recess is desired in the key face, then the lock and key are placed on step 24. Recesses of different depths ranging between the shallow and deep recess may be obtained by positioning the block and key on different ones of the steps 21, 22 or 23.

This invention is adapted for use in drilling recesses into the key faces at different angles, thus, if the recesses are to be at a relatively small angle such as the angle X of 7 degrees, for example, the block 10 is provided with a key-receiving hole 17 therein such that the main faces of the key when inserted into this hole will be at an angle of 7 degrees with respect to the horizontal line Y. Since the drill-receiving holes provided to the block 10 are at right angles to the prism faces thereof, the recesses drilled into the key blank by positioning the drill bit into these holes will be at the aforesaid angle of 7 degrees with respect to the planes of the key blank.

The tumbler-receiving recesses formed in the key may be formed therein at right angles to the faces of the key where the key is to be used with the tumbler cylinder lock 25, such as shown in FIG. 6, and in such case the block 10a shown in FIG. 2 is employed for drilling the recesses into the key faces. A larger angle Z of 20 degrees, for example, such as shown in the right hand block 10b of FIG. 2, may be employed for drilling the tumblerreceiving recesses in the key blank. In this case the keyreceiving hole is disposed at an angle of 20 degrees with respect to the drill-receiving holes provided to the sides 13b, 14b and 15b of the block 101). FIG. 4 illustrates a block in which the key hole is disposed at an angle C of about 13 degrees with respect to the drill holes. This figure shows the comparison of the 7 degree angle and the 13 degree angle.

On the other hand, where a key is to be made for a tumbler lock 26, such as shown in FIG. 7, in which the tumblers in the different tumbler sets are disposed at different angles with respect to the faces of the key, then the different recesses in each face of the key may be drilled by using different ones of the locks 10, 10a and 10b shown in FIG. 2 so that the recesses drilled into the key faces will have angles corresponding with the angles of the tumblers of the cylinder lock.

It will also be noted that the keyholes in the various blocks are offset from the drill holes. Thus, the tumbler recesses drilled into the key are also offset with respect to the longitudinal axis of the key so that the key may be provided with two sets of recesses on the main faces thereof. Recesses may also be provided to the opposing narrow faces of the key. As a result, the key may be inserted into the cylinder lock with either narrow edge of the key uppermost.

While I have shown a preferred embodiment of this invention it will be understood that the invention is capable of variation and modification from the form shown so that the scope thereof should be limited only by the proper scope of the claims appended hereto.

What I claim is:

1. In a fixture for drilling different key combinations into a substantially rectangular key employed in cylinder-type tumbler locks in which the tumblers are positioned at predetermined angles with respect to the faces of the key, the combination comprising a block having a key-receiving hole substantially rectangular in cross section and extending substantially along the axis of said block for receiving a key blank, said block having peripherially spaced rows of drill holes extending from the outer surface thereof to said key-receiving hole to receive a cutting tool for cutting recesses into the key blank positioned in said key-receiving hole, said drill holes being disposed at predetermined angles with respect to the sides of said key-receiving hole to provide the same predetermined angles that the lock tumblers make with the faces of said key, and a support for said block, said support having means to selectively position said block in the direction of the cutting tool received in said drill holes, thereby controlling the depths of the recesses cut into the key blank.

2. In a fixture for drilling different key combinations into keys employed in cylinder-type tumbler locks, the combination as set forth in claim 1 further characterized in that said block is in the form of a prism with a plurality of substantially fiat sides in which said drill-receiving holes are provided.

3. In a fixture for drilling different key combinations into keys employed in cylinder-type tumbler locks, the combination as set forth in claim 2 further characterized in that said support means comprises flat steps on which said substantially flat sides of said block are adapted to be positioned during cutting of the recesses in the key so that the recesses may be cut to predetermined depths.

4. In a fixture for drilling different key combinations into keys employed in cylinder-type tumbler locks, the combination as set forth in claim 3 further characterized in that said block is a substantially square prism and said drill-receiving holes are provided in rows on three of the sides of said prism.

References Cited UNITED STATES PATENTS 3,276,328 10/1966 Schreiber et al 9013.05

ANDREW R. JUHASZ, Primary Examiner G. WEIDENFELD, Assistant Examiner US. Cl. X.R. 7762; 90-11 

